Scarfing machine



Feb. 16, 1943. D. H. DUFFY SCARFING MACHINE Filed May 18, 1942 5 Sheets-Sheet l INVENTOR. DAT/1a 15C -DUFFX Z/ %%WA4 Feb. 16, 1943. D. H. DUFFY I SCARFING MACHINE Filed May 18, 1942 s Sheets-Sheet 2 INVENTOR. DAVID 111 DUFFY.

Feb. 16, 1943.

D. H. DUFFYA SCARFING MACHINE Filed May 18, 1942 s Sheets-Sheet 3' Patented Feb. 16, 1943 SCARFING MACHINE David H. Duffy, Wichita, Kans., assignor to Beech Aircraft Corporation, Wichita, Kans., a corporation of Delaware Application May 18, 1942, Serial No. 443,379

7 Claims.

This invention relates to a scarfing machine and has for its principal object a power driven cutter as beveling means for sheets of material while the machine is manually conveyed.

A further object of this invention is to accomplish speedily and accurately, a mechanically uniform beveling, or scarfing, operation to form a joint by interlapping the beveled portions of two sheets whereby the corresponding sides of the sheets are on the same plane.

These and other objects will hereinafter be more fully explained, reference being had to the accompanying drawings forming a part of this specification, and in which like characters will apply to like parts in the different views.

Referring to the drawings:

Fig. 1 is a side view of the machine operatively applied to a panel.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is a View of the roller arrangement carried by the outer ends of the arms.

Fig. 4 is a sectional View taken on line 4-4 in Fig. 1.

Fig. 5 is a sectional view taken on line 5-5 in Fig. 1.

Fig. 6 is a side view of the machine, partly in section to illustrate the slant of the cutter.

Fig. '7 is a sectional view taken on line 'l-| in Fig. 4.

Fig. 8 is a sectional view taken on line 8-8 in Fig. 7 to illustrate the slot foradjustment of a vertically disposed roller.

The invention herein disclosed relates to a scarfing machine comprising upper and lower arms I and 2, respectively, said arms at their rear ends having their respective arcuate portions of a clamp 3 and 4 removably connected thereto by cap screws 5.

Each clamp portion has an ear 6 outwardly extending from each side thereof as connectin means for the clamp portions together through the medium of bolts 1 passing through the ears as shown in Fig. 5, said clamp portions being internally threaded to engage with the threaded hub A of a motor 8 as carrying means therefor slanting from a horizontal plane for the purpose later described.

To lock the motor in position the clamp portions are tensioned together by tightening the bolts 1.

It will be seen that the lower arm 2 has a greater offset outward than the upper arm to accommodate for the upward slant of a cutter 9 that is aligned with the axis of the motor, the slant of the cutter to cross the marginal edge of e, sheet-like element, or a plywood panel l0 that is positioned beneath the cutter and being beveled thereby as shown in Fig. 6, said sheet being snugly engaged by rollers above and below thereof as later described.

Transversely positioned to the other end of said arms are cross bars II and I2 respectively, the lower bar being secured to its respective arm by a cap screw l3, while the upper bar is secured to its respective arm by a handle I4 extending through the arm and being shouldered as at B to draw the bar to snug engagement with said arm by its threaded engagement with the handle, said upper bar being notched as at C to avoid contact with the outer end of the cutter substantially as shown in Figs. 3 and 4.

Each cros bar has a pair of rollers l5 for each of its vertically disposed sides, said rollers being journalled on spindles l6 as shown in Fig.

upper and lower bars as shown in Fig. 3. The

upper bar has one roller of its inside pair slanting downward to engage on the beveled portion D of the sheet, by which means the beveled portion is supported against deflection or vibration during action of the scarfing cutter, and furthermore, the said rollers serve as a guide to properly position the machine and to avoid friction wliile moving the machine manually on the sheet.

There is also provided a pair of vertically disposed rollers carried by a cross bar l8 that is secured to the upper side of the lower arm by cap screws IS, the head of which is countersunk in the arm, each roller being journalled to its respective end of the bar by a spindle 20 seated in an elongated slot 2| that extends transversely of the bar l8 as means to move the roller toward and from the edge of the sheet to gauge the Width of the scarfing and to insure a feather edge. Each vertically disposed roller seats on a washer 22, the upper peripheral edge of which is rounding with respect to cross section to function as a guide and a rest for the edge of the sheet as the latter engages with the roller.

Furthermore there is provided a bed plate 23 on which a marginal portion of the sheet will slidably engage as the cutter forms the bevel, and

the said bed plate is means to support the feathered edge of the sheet as the cutter works.

The cutter above referred to is an elongated spindle-like structure secured axial with the shaft 24 of the motor, said cutter having a hexagonal hub 25 axially bored and threaded to engage on the threaded end of the shaft, the spindle portion of the cutter having a longitudinal groove whereby a cutting edge is formed at one of the grooves the entire length of the spindle, which is of sufficient length to extend well over the beveled portion made thereby as the machine is conveyed along the sheet, the conveyance of which is through the medium of the said handle M for one hand while the outer portion of the machine may be gripped by the other hand to assist in a steady movement. The motor referred to may be electrically or pneumatically operated, the latter being shown in the drawings.

To bevel a sheet the same may be suitably secured to a bench 2E and outwardly extending therefrom as means to align the edge of the sheet, and being rigidly supported simplify the application of the machine. It will now be seen that the marginal edges for sheets may be accurately beveled to interlap for gluing of the same together so that the corresponding sides will be flush with each other.

It will also be seen that a guard 2'! is provided and secured to the upper side of the upper arm so that flying particles removed from the sheet by the cutter will be directed downward and outward without interrupting the operator of the machine.

Such modifications may be made as lie within the scope of the claims.

Having fully described this invention what is claimed as new and desired to secure by Letters Patent is:

1. In a scarfing machine, a motor, a spindle cutter, and means to secure the same to the motor at its turning axis, a clamp and means to secure the same to the motor, a pair of arms to carry the clamp, said arms oppositely positioned and secured to the periphery of the clamp and extending from one side thereof, said arms converging outward from the clamp, rollers carried by each arm at their convergent ends and being spaced apart to receive sheets of material therebetween, and vertically disposed rollers to gauge the inward extension of the said sheet a predetermined 'distance inward of the arms to where the edge of the sheet material will meet the cutter. V

2. In a scarfing machine of the class described, comprising a motor and arms, a corresponding end of each arm being secured to the motor, a

cutter secured to a shaft of the motor and ex-.

tending axially therewith, rollers carried by the other end of each arm and being in spaced'relation to engage oppositely on the sides of sheet material positioned between the arms and extending toward the motor so that a marginal portion of the sheet will be selectively beveled by the cutter as the motor turns and the machine is conveyed along the edge of the sheet.

3. In a scarfing machine of the class described, a pair of arms, a scarfing cutter and a motor to actuate the cutter, clamping means to secure "one end of each arm to the, motor, one portion of the arms correspondingly having an offset outward from each other suihcient to span the motorfthe other portion of the arms being in parallelism and spaced apart to receive a sheet of material substance therebetween, means secured to the arms at the extremity of the parallel portionsto selectively engage the said sheet to steady the machine as moved therealong, and gauge means carried by one of the arms to guide the machine in parallelism with the edge of said sheet material while beveling the edge thereof.

4. In a scarfing machine, a pair of arms spaced apart and being connected to an annular clamp that is diametrically divided and internally threaded, each arm carrying its respective portion of the clamp and bolt means to secure the clamp portions together, a motor having one end thereof threaded to be engaged by the threaded clamp, a spindle cutter detachably secured to the end of the motor shaft that extends outward between the arms, the turning axis of the motor and cutter slanting from a horizontal plane between the parallel portion of the arms,

and rollers horizontally carried by the last said ends of the arms as a guide for the machine while beveling the edges of the sheet material.

5. In a scarfing machine, a motor, a pair of arms oppositely positioned, and clamping means to secure corresponding ends of the arms to the motor in such a way as to slant the turning axis of the motor toward one of said arms, a cross bar secured to the other end of each arm, a pair of rollers journalled on two sides of each bar, oppositely extending therefrom in parallelism except one of said rollers that slants toward the turning axis of the motor and being in parallelism therewith, a cross bar spaced inward from the first said bars, and rollers vertically disposed and adjustably journalled on the second said bar to function as a stop for sheets of material extending inward between the first said rollers carried by their respective bars, and a cutter secured to one end of the motor shaft extending outward between the said arms, said cutter to bevel the edge of the sheet material as the machine is conveyed therealong.

6. Ina scarfing machine, a pair of arms spaced apart, each of which has an offset outward from each other for one portion of the arms, the offset of one arm being greater than that'of the other, the other portion'of said arms being substantially in parallelism and spaced apart, an annular internally threaded clamp carried by and between the offset portion of the arms, said clamp slanting inward to where it joins the arm having the greater offset, a motor threadedly engaging in the clamp, an elongated scarfing cutter secured to the motor axial thereof, the slant of the clamp to range the motor axis and cutter across the axis between the parallel portions of the arms to bevel the edge of a sheet of material carried between the arms as the scarfing machine is moved along the edge of said sheet of material.

7. In a device of the class described comprising an upper and a lower arm, an annular element secured to the arms at oneend thereof to longitudinally space the arms apart, a drive shaft journalled in said element, one end of said drive shaft extending inward from said end of the arms, a cutting element, one end being secured to said end of the drive shaft, the other end terminating adjacent the'other end of the arms,

horizontally positioned rolling means mounted on each "en'dof the last said ends of the arms to receive a sheet of material therebetw'een and direct the sheet in contact with the cutting element, vertically positioned rolling means mounted on one of the arms a spaced distance inward from last said end of the arms to functionas a gaugefor an inward movement of the sheet be- 

